COD的测定(英文)

COD MN测定/COD MN measurement

1 概述/overview：

水中耗氧量是相对表示水被有机物污染的程度，本方法是KMnO4氧化还原滴定法

Oxygen consumption in water is comparatively to mean water pollution level by organic matter ,this method is KMnO4 Redox titration.

2 试剂/reagent：

2.1 0.01mol/LKMnO4

2.2 0.01mol/L H2C2O4

2.3 1∶3 H2SO4

3 测定方法/measurement method：

3.1 取100ml水样/ take 100ml water sample

3.2加10ml1∶3 H2SO4及10ml0.01 mol/LKMnO4溶液，

/add 10ml1∶3 H2SO4 and 10ml0.01 mol/LKMnO4 solution

3.3在沸腾水浴锅内加热30min，

/ heating it in boiling water bath pan 30 min

3.4迅速加入10ml0.01mol/L H2C2O4标准溶液

/immediately add 10ml0.01mol/L H2C2O4 standard solution

3.5以0.01 mol/LKMnO4(1/5KMnO4)溶液滴至玫瑰红，经1min不消失，/with 0.01 mol/LKMnO4(1/5KMnO4) solution drip to pink rose, hold 1min not disappeared.

记下0.01 mol/LKMnO4(1/5KMnO4)消耗量a1。

/note down 0.01 mol/LKMnO4(1/5KMnO4) consumption value a1.

4 计算/calculation：

a1×0.01×8×1000

COD（PPm）=--------------------------- =0.8 a1

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